Pump



Sept. 21 ,11926.

K G. D. WHlT-E PUMP Filed Feb. 12 1923 2 Sheets-Sheet 2 Patented Sept. 21, 1926.

4`.UNITED STATES PATENT OFFICE.l

GEORGE D. WHITE, OF PORTAARTHUR, TEXAS, ASSIGNOR TO THE TEXAS COMPANY, OF

NEW YORK, N. Y., A CORPORATION OF TEXAS.

. PUMP.

Application filed February 12, 1923. Serial No. 618,432.

This invention relates particularly to pump mechanism adapted for handling uids at high temperatures.

Diiiiculty has been experienced in provld- 5 ing pumps capable of operating successfully on hi hly heated fluids. It has been found diliicit to keep the pump liner properly lubricated at high temperatures with the resnit that rapid deterioration xof the pump i0 mechanism usually accompanies the attempt ina relatively -cool condition,

to pump hot fluids with existing types of pumps. Moreover, it has been found practically impossible to maintain the stufling boxes and bearings at a suliiciently low temperature to insure that the packing material and bearings will function properly. This defect has been especially detrimental when employing high pressures with the high temperature since the application of heat has caused the packing material to be readily permeable by the hot fluid .with the result that leakage occurs under high pressures.

The primary object of my invention is to avoid these diiiculties and to provide ypump mechanism adapted for efficiently and economically handling fluids at high temperatures.

The pump constituting my invention preferably assumes the form of opposed helices mounted on a shaft coaxial with the pump cylinder and having a port intermediate the helices and other ports at the* ends of the cylinder beyond the helices, the arrangement vbeing such that the fluid to be lpumped may be admitted by means of the central port and conveyed by the spirals to outlet ports at the ends of the cylinder, or the end ports may constitute the inlets ofthe pump and 4the intermediate port the outlet. Y By roviding opposed helices on a common s aft so that the flow of fluid through the cham ber is not all in the same direction it is possible to materially reduce the thrust action on the shaft to which the screw type pumps are generally subjected. Specific o jects of the invention that may be mentioned are: to reduce the number of stuliing boxes from that usually required in `pumps emplo ing the screw'type principle and to rovi e means for maintaining the stufling oxrand bearings of the pump shaft Other objects as well as the particular advantages of. the invention wil become apparent from the following detailed description thereof, reference being had to the accompanving drawings wherein:

' thereof.

Figure 2 is a longitudinal section of a modified form of the invention.

In the example of `the invention illustrated in Figure 1 a pump casing or cylindrical member 10 is provided within which is' coaxially mounted the pump shaft 11. The pump casing is fitted 1nteriorly with a liner 12 composed of cast iron or other sui-table material. The shaft 11 carries opposed helices v13 and 14. In the central portion of the pump chamber intermediate the opposed helices 13 and 14 one or more ports 15 are provided and at the ends of the pump chamber beyond the helices one or more ports, as

16 and 17, are provided. It will be observed shaft is shown as having a right-hand spiral 13 and. a left-hand spiral 14 and assuming' that the shaftis rotated in a clock-wise direction it is apparent that the operation of the spirals would be such that the ports 16 and 17 would serve as inletsand the port 15 as an outlet. The action may be reversed either by changing the direction of rotation of the shaft 11 or by changing the helices mounted on the shaft. The port 15 is shown as communicating with a pipe 18. The ports 16 and 17 communicate with a manifold 19 through pi es 20 and 21respectively, and the mani old pipe leads to a co uit 22.

At one end of the cylinder 10 box for the shaft 11 is provided which may assume the form of a box 28, packing mate rial 24, and a gland or follower 25. The end of' the cylinder may be threaded, as shown, ffor the attachment of a flange 26 and the stuflin box secured thereto at the end of the c 'nder by means of bolts 27, as illustrat Adjacent the other end of the shaft is bearing 28, This bearing is refer-ably made in the form of a disc fitted)y cylinder 10 and provided with a plurality of openings 29 for the passage of fluid. The bear ng end of the cylindermay be closed by loosely in thel stuffingI tending through said casing, opposed helices disposed on said shaft between the ports, and means mounted on the shaft and forming substantial seals with the walls of the casing between the ports and the ends of the casing and. forming cooling chambers at the ends of the casing.

4. A pump for hot liquids comprising an elongated casing having a. lurality of spaced ports intermediate its en s, a. shaft coaxial with and extending through said casing, a stufing box 1n the casing for one end of the shaft, a bearing for the shaft in the opposite end of the casing, opposed helicesdisposed on seid shaft between the ports, and means mounted on the Shaft between the ports and the ends of the casing forming cooling chambers at the ends 01": the casing' for protecting the stuing box and the bearing from' direct contact with the-hot liquid being pumped.

In witness whereof I have hereunto set' m hand this 29th day of January, 1923.

GEORGE D. WHITE. 

